I found a good ID Bore mic a couple days ago and was able to strike a great deal on it. I got it for $50.00 out the door, been watching for one since I lost my old one in the break in a few years ago. I've been getting by using snap gages and OD mics until now. It's a Fowler 4"-12" ID mic.
Bore gauge is on my list of things needed. I got a K321 for my uncle to rebuild and then that tecumseh on the side tag is going to get rebuilt in the winter.